Adhesive film and flat cable using the same

Abstract

There is provided an adhesive film, comprising: an insulator film; an adhesive layer formed on the insulator film; and an intermediate adhesive layer interposed between the insulator film and the adhesive layer, wherein the intermediate adhesive layer is made of a mixed resin composition of a copolyamide being a crystalline resin solvable in a non-halogen based organic solvent and having a melting point of 100° C. or more and 150° C. or less, and a non-crystalline resin, and the intermediate adhesive layer contains a non-halogen flame retardant by 100 pts. wt. or more and 250 pts. wt. or less with respect to 100 pts. wt. of the mixed resin composition.

What is claimed is: 
     
       1. An adhesive film, consisting of:
 an insulator film; 
 an adhesive layer formed on the insulator film, the adhesive layer made of a material containing any one of resins of polyester, thermoplastic polyurethane, and copolyamide; and 
 an intermediate adhesive layer interposed between the insulator film and the adhesive layer, 
 wherein the intermediate adhesive layer is made of a material containing a mixed resin composition, the mixed resin composition consisting of a copolyamide and a non-crystalline resin; 
 wherein the copolyamide is a crystalline resin solvable in a non-halogen based organic solvent and having a melting point of 100° C. or more and 150° C. or less, and the non-crystalline resin consists of a non-crystalline copolyamide or non-crystalline polyester; 
 wherein a content of the non-crystalline resin is 10 pts. wt. or more and 80 pts. wt. or less, with respect to 100 pts. wt. of the copolyamide; and 
 wherein the intermediate adhesive layer contains a non-halogen flame retardant by 100 pts. wt. or more and 250 pts. wt. or less with respect to 100 pts. wt. of the mixed resin composition. 
 
     
     
       2. The adhesive film according to  claim 1 , wherein the copolyamide is solvable in a mixed solvent, the mixed solvent including i) a hydrocarbon solvent having a boiling point of 140° C. or less and ii) alcohols. 
     
     
       3. The adhesive film according to  claim 2 , wherein the mixed solvent includes toluene and alcohols, or methylcyclohexane and n-propyl alcohol. 
     
     
       4. The adhesive film according to  claim 1 , wherein the non-halogen flame retardant is at least one of a flame retardant selected from the group consisting of a phosphorous compound, a nitrogen compound, and a metal compound. 
     
     
       5. The adhesive film according to  claim 1 , wherein the resin of the adhesive layer is solvable in a non-halogen based organic solvent having a boiling point of 120° C. or less. 
     
     
       6. The adhesive film according to  claim 1 , wherein thickness Ta of the insulator film, thickness Tb of the adhesive layer, and thickness Tc of the intermediate adhesive layer satisfy a relation of Tc>Ta>Tb. 
     
     
       7. The adhesive film according to  claim 1 , wherein the insulator film is a polyethylene terephthalate film having a thickness of 9 μm or more and 35 μm or less. 
     
     
       8. A flat cable comprising:
 a pair of the adhesive films according to  claim 1  integrally formed by adhesion; and 
 a plurality of conductors arranged in parallel on planes interposed between adhesive films of the pair. 
 
     
     
       9. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline copolyamide, and the material of the adhesive layer contains polyester. 
     
     
       10. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline copolyamide, and the material of the adhesive layer contains polyurethane. 
     
     
       11. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline copolyamide, and the material of the adhesive layer contains a copolyamide. 
     
     
       12. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline polyester, and the material of the adhesive layer contains polyester. 
     
     
       13. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline polyester, and the material of the adhesive layer contains thermoplastic polyester. 
     
     
       14. The adhesive film according to  claim 1 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline polyester, and the material of the adhesive layer contains a copolyamide. 
     
     
       15. An adhesive film, comprising:
 an insulator film; 
 an adhesive layer formed on the insulator film, the adhesive layer made of a material containing any one of resins of polyester, thermoplastic polyurethane, and copolyamide; and 
 an intermediate adhesive layer interposed between the insulator film and the adhesive layer, 
 wherein the intermediate adhesive layer is made of a material containing a mixed resin composition, the mixed resin composition consisting of a copolyamide and a non-crystalline resin; 
 wherein the copolyamide is a crystalline resin solvable in a non-halogen based organic solvent and having a melting point of 100° C. or more and 150° C. or less, and the non-crystalline resin consists of a non-crystalline copolyamide or non-crystalline polyester, 
 wherein a content of the non-crystalline resin is 10 pts. wt. or more and 80 pts. wt. or less, with respect to 100 pts. wt. of the copolyamide; and 
 wherein the intermediate adhesive layer contains a non-halogen flame retardant by 100 pts. wt. or more and 250 pts. wt. or less with respect to 100 pts. wt. of the mixed resin composition. 
 
     
     
       16. The adhesive film according to  claim 15 , wherein the intermediate adhesive layer further comprises a carbodiimide compound. 
     
     
       17. The adhesive film according to  claim 15 , wherein the adhesive layer further comprises a non-halogen flame retardant. 
     
     
       18. The adhesive film according to  claim 17 , wherein the non-halogen flame retardant is 5 pts. wt. or more and 100 pts. wt. or less with respect to 100 pts. wt. of the resin of the adhesive layer. 
     
     
       19. The adhesive film according to  claim 15 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline copolyamide, and the material of the adhesive layer contains polyester, polyurethane, or a copolyamide. 
     
     
       20. The adhesive film according to  claim 15 , wherein the copolyamide of the mixed resin composition is a crystalline copolyamide, the non-crystalline resin of the mixed resin composition is a non-crystalline polyester, and the material of the adhesive layer contains polyester, thermoplastic polyester, or a copolyamide.